gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/aura/test/test_screen.h

Index: ui/aura/test/test_screen.h
diff --git a/ui/aura/test/test_screen.h b/ui/aura/test/test_screen.h
index 69b0b089d52e6656721716785ebe918d3f787be4..f2370563d94d8ecafb050b549ecc60c22aa6e56b 100644
--- a/ui/aura/test/test_screen.h
+++ b/ui/aura/test/test_screen.h
@@ -49,7 +49,7 @@ class TestScreen : public display::Screen, public WindowObserver {
 
   // display::Screen overrides:
   gfx::Point GetCursorScreenPoint() override;
-  gfx::NativeWindow GetWindowUnderCursor() override;
+  bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   int GetNumDisplays() const override;
   std::vector<display::Display> GetAllDisplays() const override;